# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
from superset.db_engine_specs.postgres import PostgresBaseEngineSpec


class RedshiftEngineSpec(PostgresBaseEngineSpec):
    engine = "redshift"
    max_column_name_length = 127

    @staticmethod
    def _mutate_label(label: str) -> str:
        """
        Redshift only supports lowercase column names and aliases.

        :param label: Expected expression label
        :return: Conditionally mutated label
        """
        return label.lower()
